BISMANOL PERMANENT MAGNETS, EVALUATION AND PROCESSING

reportActive / Technical Report | Accession Number: AD0005310 | Open PDF

Abstract:

Bismanol permanent magnets were evaluated for stability under various operating conditions. The magnets, after low-temperature stabilization, exhibited a magnetic flux constancy over a wide temperature range with some loss in original energy. The magnets were stable magnetically to shock, vibration, centrifugal force and stray magnetic fields. The application of a protective coating was recommended to prevent corrosion in atmospheres of high RH. The processing techniques for bismanol magnets were improved by eliminating magnetic separation. Excess bismuth is separated from the melt by hot-pressing prior to pulverization. Bismanol magnets were made with maximum energy products up to 5.3 x 10 to the power of 6 gauss-oersteds. Present maximum value for the coercive force is 3650 oersteds and 4800 gauss for the residual flux density. Various types of pulverizing equipment were also evaluated with respect to the magnetic properties of the resulting compacts. Methods are discussed for determining percentage purity Mn-Bi content, alignment, and effective particle size in bismanol magnets.

Author(s):
Adams, Edmond ; Hubbard, William M.
Author Organization(s):
NAVAL ORDNANCE LAB WHITE OAK MD
Pagination:
0023

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release, Document Partially Illegible
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited. Document Partially Illegible.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NAVORD-2686
Monitor Series:
2686, NAVWEPS
 Subject Terms
Joint Capability Areas:
JCA_6.4.1_Secure Information Exchange; JCA_6_Net Centric; JCA_6.1.2_Wireless Transmission; JCA_6.4_Information Assurance; JCA_3.2_Engagement; JCA_3_Force Application
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*COERCIVE FORCE, *PERMANENT MAGNETS, STABILIZATION, METHODOLOGY, PARTICLE SIZE, TEMPERATURE, LOW TEMPERATURE, MAGNETIC FIELDS, MAGNETIC PROPERTIES, VIBRATION, CORROSION, CENTRIFUGAL FORCE, FLUX DENSITY, MAGNETIC SEPARATION, MAGNETS, PROCESSING, FLUX(RATE), ENERGY, PURITY, RESIDUALS, PROTECTIVE COATINGS, RANGE(EXTREMES)
Field(s)/Group(s):
Electricity and Magnetism
Report Date:
1953 Jan 05